Improvement in cement-lined pipes



M. STEPHENS.

Cement Lined Pipes.

. 910.137,970. PatentedApril15,1873'.v W

AM. PHoTo-UTHOGRAPH/c co. Mx (ossonwemaafm) UNITED STATES PATENT QEFICJE.

v MELVIN STEPHENS, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN CEMENT-UNED PIPES.

Specification forming part of Letters Patent No. 137,970, dated April 15, 1873; appication tiled october 29, 1872.

To all whom 'it may concern:

Beit known that I, MELvIN STEPHENS, of

i Brooklyn, Kings county, New York, have in vented anlmprovementinOement-LinedIipes, of which the following is a specification Y My invention consists in a cement lined metal pipe, provided at one end with a short taper or cone, to enter a similarly-shaped recess in the cement of the next pipe, whereby the thin edges of the cement are protected by the metal, and when put togetherl the ends are held in a correct relative position, and one pipe may diverge slightly from the line ot' the next. Iv also employ a ring that is placed edgewise of the metal around the sheet-metal pipe, to strengthen the same and prevent the external pressure injuring or misshaping t-he pipe.

In the drawing, Figure l is a section orn the joint with the tapering metallic end made as part ,of the sheet-metal pipe, and Fig. 2 is a similar view, with4 a separate tapering ri ug attached to the pipe.

The sheet'metal tube a, with the cement lining b, and exterior coating c, are of any desired character,i"except that at one end the eemen t-linin g o does not terminate square, but is recessed or tapered inwardly, and at the other end of the pipe the metal tube a is contracted or tapered as at e to enter the similarly-shaped recessed end ot' the next pipe, the parts being coated with cement before they are put together, and these conical or tapering portions guide the ends of the pipe, 'andV steady them in their correct relative positions, while the joint is being made, either of cement alone, or of cement with an inclosing ring or band, and the exterior ofthe pipe is being coa-ted with cement.

the sheet-metal tube a., as seen in Fig. 1, and

this ring, being very stift', will support the metal pipe and prevent it being iiattened or put out of shape by the pressure or weight ot earth. This ring may be applied nearvthe ends, or at one or more places along the pipe, and it may be placed within the pipe, it' desired.

I do not claim a tapering or conical joint introduced within a cement-lined pipe, nor a cast-metal ring surrounding the` shcetmetal into which the tap is screwed.

I claim as my invention- 1. 'lhe sheet-metal cylinder a., lined with cement and provided with a short taper or cone, e, at one end, the sheet metal covering the taper or cone of the lining and extending to the inner surface, or nearly so, of the lining, substantially as and for the purpose set forth.

2. The thin metallic ring h applied edge wise to and combined with the metallic tube of a cement-lined pipe, for the purposes set forth.

Signed by me this 22d day of October, A. D. 1872.

MELVI-N STEPHENS. Witnesses:

GEo. T. PINCKNEY, GHAs. H. SMITH. 

